Across
- 3. What is the two dimensional representation that the electrons occupy.
- 6. that does not apply to both neutrons and proteins in nuclei rule.
- 8. the central region of an atom.
- 9. Present in the body in very small amounts.
- 10. What is a pure substance composed of atoms of only one kind.
- 11. 600 billion trillion
- 14. The attraction between opposite electrical charges.
- 15. Electrons that travel around the nucleus at high speed, within a spherical area which is called?
Down
- 1. Electrons travel in complex patterns around nucleus.
- 2. Protons plus neutrons.
- 4. What holds the participating atoms together once the chemical reaction has needed.
- 5. The sum of the atomic weights of it's component atoms of a molecule.
- 7. How many elements exist in nature?
- 12. What are atoms composed of?
- 13. Which is the simplest atom with an atomic number of 1.